Speed-varying mechanism.



PATENTED MAR. 28, 1905. M. 0. REEVES. SPEED VARYING MECHANISM.

APPLICATION FILED DEC. 21. 1903.

2 SHEE'I'8-SHEET 1.

. avwemm Milton Reeves y Gila/M PATENTED MAR. 28, 1905. M. 0. REEVES.SPEED VARYING MECHANISM.

APPLICATION FILED 17110.21. 1903.

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Milton 0. Reeves UNITED STATES Patented March 28, 1905.

PATENT OEEIcE.

MILTON O. REEVES, OF COLUMBUS, INDIANA, ASSIGNOR TOREEVES PULLEYCOMPANY, OF COLUMBUS, INDIANA, A CORPORATION OF INDIANA.

SPEED-VARYING MECHANISM.

SPECIFICATION forming part of Letters Patent No. 785,917, dated March28, 1905.

T0 on whom it may concern:

Be it known that I, MILTON O. REEVES, a citizen of the United States,residing at C0- lumbus, in the county of Bartholomew and State ofIndiana, have invented certain new and useful Improvements inSpeed-Varying Mechanisms, of which the following is a specification.

In speed-varying mechanisms of the type shown in Patent No. 603,067,issued April 26, 1898, to the Reeves Pulley Company, the action of theV-shaped belt upon the cone-shaped disks is like the successive drivingintroduction of a plurality of wedges between the disks, and as aconsequence the thrust exerted by the disks upon the bearings controlledby the shifting lever is considerable.

The object of my present invention is to produce a construction whichwill automatically during normal operation substantially entirelywithdraw the thrust from said bearings and cause the two disks tointeract one upon another and place all or substantially all of thestress upon themselves and their connections.

The accompanying drawings illustrate my invention.

vFigure 1 is a plan with the driving-belt shown in section; Fig. 2, anenlarged elevation of one pair of disks; Fig. 3, a perspective View of adetail, and Fig. 1 an axial section of a modified form.

In the drawings, indicates the drivingshaft, which is to be rotated at aconstant speed, and 11 indicates the driven shaft, which is to berotated at a varying speed. Rotatably mounted upon shaft 10 is a pair ofdisks 12 12, each of which is provided on the periphery of its hub witha spiral groove or thread 13. Secured to shaft 10 between the two disks12 is a collar 14, provided with a plurality of oppositely-projectingpins 15, which are parallel with the shaft and which project throughsuitable slots 16, formed in the disks 12 at a point below the lowestoperating-point of a usual'V-shaped driving-belt 17. Each of the pinscarries on each of its ends a head 15', within which is pivoted upon anaxis 15 at right angles to the axis of shaft 11 a shoe 15', which shoefits the adjacent groove or thread 13. The grooves 13 are so arrangedthat when a driving impulse is given to shaft 10 in the directionindicated by the arrow on collar 14 and the disks 12 are held stationaryshoes 15 will slide within grooves 0r threads ,13 and draw the disks 12together axially upon shaft 10. Similarly shaft 11 has rotatably mountedupon it a pair of driven disks 18 18, the hub of each of which isprovided with a groove or thread 19, the inclination of said threadsbeing exactly opposite to the inclination of threads 13. Shaft 11carries a collar 20 between the two disks 18, which collar carriesoppositely-extending arms 21, each having at each end a head 22, withinwhich is pivoted the shank of a shoe like shoe 15', mounted in theadjacent groove or thread 19, the arms 21 passing through slots 23 inthe disks 18. Each of the disks is provided at the outer end of its hubwith a suitable thrustbearing 25, each of which takes against a yoke 26,and these yokes are connected by two shifting levers 27 27 in a mannerwell known in this type of machine.

In operation with the parts in the position shown in Fig. 1, supposeshaft 10 be rotated, collar 1A will be driven in the direction indicatedby the arrow, and pins 16 will be also revolved about the shaft 11, andshoes 15 .will slide in grooves 13, and thus tend to draw the two disks12 together. This tendency, however, will be resisted by the belt 17,and consequently the shoes 15 serve to drive the disks 12 in the samedirection as shaft 10, also driving belt 17 in the same direction. Thebelt 17 thereupon acts upon the disks 18, which being driven in thedirection indicated by the arrow slide grooves 19 beneath the shoestherein, thus tending to draw disks 18 together, this tendency beingresisted by the transverse resistance of the belt 17, and therebycausing a rotation of shaft 11. As a consequence the wedging force ofthe belt is resisted by the consequent tendency of the disks to drawtogether, so that the thrust is taken away from the bearings 25, andthere is a less thrust upon these bearings except at the time whenlevers 27 are swung, so as to shift the two pairs of disks upon theirshafts. When this takes place, the disks will have a rotation upon theirshafts.

In Fig. a I show a modification. Here the central collar of the shaft isdispensed with, as are the oppositely-extending arms, the shoes, &c. andinstead the bore of the hub of the disk is provided with a thread 30,which receives a thread-key 81.

I claim as my invention 1. In a speed-varying mechanism of the typedescribed, the combination with a shaft, and a pair of cone-shapeddriving-disks mounted thereon and both axially and angular-1y movablerelatively thereto, of a driving connection between the shaft and diskcapable of relative angular displacement, whereby relative angulardisplacement between the disks and shaft will cause opposite axialmovement of the two disks upon the shaft.

2. In a speed-varying mechanism of the type described, the combination,with a pair of parallel shafts, of two pairs of cone-shapeddriving-disks one pair mounted upon each of said shafts, an intermediatedriving connection between the driven shaft and its pair of diskstending upon forward rotation of said driving-shaft to angularlydisplace the shaft within the disks and consequently draw the diskstogether, a driving connection between the driven disks and the drivenshaft tending upon driving of the driven disks to displace said drivendisks upon the driven shaft angularly and consequently to draw thedriven disks together, and a belt running between the two pairs ofdisks.

3. In a speed-varying mechanism, the combination, with a shaft and apair of coneshaped driving-disks sleeved thereon, and having a pair ofoppositely-arranged screwthreads one formed on each of the disks, and apair of shoes carried by the shaft and mounted one in each of saidthreads, for the purpose set forth.

4. In a speed-varying mechanism, the combination, with a shaft, and apair of coneshaped driving-disks sleeved thereon and each having athread 13, and a belt running between said disks, of a collar carried bythe shaft between the disks, arms carried by the collar and extendingthrough the disks, and a shoe carried by each arm and engaging theadjacent thread, for the purpose set forth.

In witness whereof I have hereunto set my hand and seal, at Columbus,Indiana, this 7th

